The editorial cartoons of J.N. "Ding" Darling [CD-ROM] : the Cowles collection, Drake University 1912-1962. Key Biscayne, Fla. : J.N. "Ding" Darling Foundation, c1999.
Copyright is owned by the "Ding" Darling Wildlife Society; it is administered on behalf of the Society by The University of Iowa. While use within the classroom is encouraged without specific authorization, publishing this cartoon in any format requires written permission. See policy and permissions procedure at: http://www.lib.uiowa.edu/spec-coll/services/dingdarling_fees.html